Will,
I agree with you on measuring the wire size; however, upon investigation the
secondary terminals are fed with , thick flat copper bus which has much more
area then the actual secondary wires, so I'm not going to tear open the
beast to find the wires. A couple of other gentlemen suggested that maybe
the transformer has a 2 amp rating, so for the heck of it I ran the test for
6 hours at 2.0 amps and the internal temperature was 144. The first few
hours
did yield about 110 degrees as you suggested.
73,
Ken W2DTC
----- Original Message -----
From: "Will Matney" <craxd@engineer.com>
To: <amps@contesting.com>
Sent: Tuesday, June 14, 2005 12:03 AM
Subject: Re: [Amps] questions on my tranformer test
> Ken, the watt rating can be determined by the core size and then the
> current found from that. But, that dont hold true if they didn't wind the
> coil with the right size wire for its duty cycle. The only way you can
> tell for sure is find the wire size used in the coil. If you knew what the
> wire insulation was, so to know its temperature rating, you could snake a
> thermostat wire down in the center of the winding and run it under load to
> see what the coils innards are heating to. Or do the hope-so test and see
> how hot the core and coil gets by touch which isn't accurate. If its right
> for the load, the core and coil should just be warm to the touch, and not
> close to hot enough as you couldn't keep your hand on it. 180 degrees is
> way too hot for any to run. Something in the order of 100 degrees to maybe
> 110 is about maximum for one in open air.
>
> Best,
>
> Will
>
> ----- Original Message -----
> From: kenw2dtc <kenw2dtc@comcast.net>
> To: amps@contesting.com
> Subject: [Amps] questions on my tranformer test
> Date: Sun, 12 Jun 2005 14:39:52 -0400
>
>>
>> Hi,
>> I'm trying to figure out the current rating of a plate transformer. This
>> is
>> my test setup:
>>
>> http://w2dtc.com/2005-0610-transformer-test-page.htm
>>
>> Questions:
>> 1. Is this a valid way to find the secondary current capability?
>> 2. Is the internal temperature of 180 degrees F too high for a
>> transformer
>> under load for 5 hours?
>> 3. Is there a problem running this center tapped beast in a full wave
>> capacitive input configuration?
>>
>> Thanks and 73,
>> Ken W2DTC
>>
>>
>>
>>
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>
>
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